Tool correction method for mechanical arm

The invention discloses a tool correction method of a mechanical arm, which comprises the following steps of: driving a tool to intersect with a first light beam at a first intersection point and intersect with a second light beam at a second intersection point according to a first moving path; and driving the tool to intersect with the first light beam at a third intersection point and intersect with the second light beam at a fourth intersection point according to the second moving path. Then, a correction value of the tool is calculated according to the positions of the first to fourth intersection points. 本发明公开一种机械手臂的工具校正方法，其包含依据第一移动路径带动工具，与第一光束交会于第一交会点，与第二光束交会于第二交会点。及，依据第二移动路径带动工具，与第一光束交会于第三交会点，与第二光束交会于第四交会点。再者，依据第一至第四交会点的位置运算出工具的校正值。